diff --git a/include/crm/common/attrs_internal.h b/include/crm/common/attrs_internal.h
index ef533153f4..a08981cbbc 100644
--- a/include/crm/common/attrs_internal.h
+++ b/include/crm/common/attrs_internal.h
@@ -1,57 +1,66 @@
 /*
- * Copyright 2004-2024 the Pacemaker project contributors
+ * Copyright 2004-2025 the Pacemaker project contributors
  *
  * The version control history for this file may have further details.
  *
  * This source code is licensed under the GNU Lesser General Public License
  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
  */
 
 #ifndef PCMK__CRM_COMMON_ATTRS_INTERNAL__H
 #define PCMK__CRM_COMMON_ATTRS_INTERNAL__H
 
+#include <stdint.h>                         // UINT32_C
+
 #include <crm/crm.h>                        // crm_system_name
 #include <crm/common/logging.h>             // LOG_TRACE
 #include <crm/common/scheduler_types.h>     // pcmk_node_t
 #include <crm/common/resources_internal.h>  // enum pcmk__rsc_node
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 // Options for clients to use with functions below
 enum pcmk__node_attr_opts {
     pcmk__node_attr_none           = 0,
-    pcmk__node_attr_remote         = (1 << 0),
-    pcmk__node_attr_private        = (1 << 1),
-    pcmk__node_attr_pattern        = (1 << 2),
-    pcmk__node_attr_value          = (1 << 3),
-    pcmk__node_attr_delay          = (1 << 4),
-    pcmk__node_attr_perm           = (1 << 5),
-    pcmk__node_attr_sync_local     = (1 << 6),
-    pcmk__node_attr_sync_cluster   = (1 << 7),
-    pcmk__node_attr_utilization    = (1 << 8),
-    pcmk__node_attr_query_all      = (1 << 9),
+    pcmk__node_attr_remote         = (UINT32_C(1) << 0),
+    pcmk__node_attr_private        = (UINT32_C(1) << 1),
+    pcmk__node_attr_pattern        = (UINT32_C(1) << 2),
+    pcmk__node_attr_value          = (UINT32_C(1) << 3),
+    pcmk__node_attr_delay          = (UINT32_C(1) << 4),
+
+    /* @TODO pcmk__node_attr_perm is unused at the moment, but it is intended
+     * to help with implementing `attrd_updater -l/--lifetime` (see the comment
+     * in that file).  This is made more complicated by wanting to combine
+     * crm_attribute and attrd_updater functionality (see upstream task T120).
+     */
+    pcmk__node_attr_perm           = (UINT32_C(1) << 5),
+
+    pcmk__node_attr_sync_local     = (UINT32_C(1) << 6),
+    pcmk__node_attr_sync_cluster   = (UINT32_C(1) << 7),
+    pcmk__node_attr_utilization    = (UINT32_C(1) << 8),
+    pcmk__node_attr_query_all      = (UINT32_C(1) << 9),
 };
 
 #define pcmk__set_node_attr_flags(node_attr_flags, flags_to_set) do {   \
         node_attr_flags = pcmk__set_flags_as(__func__, __LINE__,        \
             LOG_TRACE, "Node attribute", crm_system_name,               \
             (node_attr_flags), (flags_to_set), #flags_to_set);          \
     } while (0)
 
 #define pcmk__clear_node_attr_flags(node_attr_flags, flags_to_clear) do {   \
         node_attr_flags = pcmk__clear_flags_as(__func__, __LINE__,          \
             LOG_TRACE, "Node attribute", crm_system_name,                   \
             (node_attr_flags), (flags_to_clear), #flags_to_clear);          \
     } while (0)
 
 const char *pcmk__node_attr_target(const char *name);
 const char *pcmk__node_attr(const pcmk_node_t *node, const char *name,
                             const char *target, enum pcmk__rsc_node node_type);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // PCMK__CRM_COMMON_ATTRS_INTERNAL__H